The pop star made her BBMA debut in 1999 when she performed “Baby One More Time” and “Crazy.” That same year she won New Artist of the Year, Female Artist of the Year, Female Albums Artist of the Year and Female Singles Artist of the Year.

Britney Spears on stage during the 2016 Billboard Music Awards.

CREDIT: AP Images.

She took home two more awards in the years following: for Albums Artist of the Year in 2000, then the Hot Dance Sales Single of the Year in 2004 for her “Me Against the Music” song with Madonna.

Tonight, Spears is set to receive the Millennium Award. So far, Beyoncé and Whitney Houston have been the only artists to receive the award.

Britney Spears on stage during the 2016 Billboard Music Awards.

CREDIT: AP Images.

In 2015, Spears and Iggy Azalea performed their single “Pretty Girls” for the first time. Spears sported latex-like thigh-high boots in black. Another one of her most popular Billboard Music Awards performances came at the 2011 awards show when she joined Rihanna for “S&M.”